Crustal Differentiation Processes at Krakatau Volcano, Indonesia Gardner, M. F. ; Troll, V. R. ; Gamble, J. A. ; Gertisser, R. ; Hart, G. L. ; Ellam, R. M. ; Harris, C. ; Wolff, J. A. Abstract Publication: Journal of Petrology Pub Date: January 2013 DOI: 10.1093/petrology/egs066 Bibcode: 2013JPet...54..149G